The 1000 Mile Fusion Sock breaks the mould, conventional sock wisdom dictates that you can either have padding for protection and comfort, or two layers for reduced friction. Padded socks are thick, double layer socks are thin. This sock's innovative design and material technology provides a sock that offers everything: BLISTER FREE GUARANTEE, together with padded comfort and protection. Full padded Achilles tendon protection Arch bracing gives additional support. Extra padding for toe, ball and heel zones. Double layer construction eliminates friction between the foot and shoe, reducing wear and preventing blisters. Tactel® inner layer wicks away perspiration to keep feet dry and cool. (06/11) Available In Mens - Click Here Covered by The 1000 Mile Guarantee! Double layer construction eliminates friction between shoe and sock, thus reducing friction between sock and foot, The skin should therefore not be rubbed by the socks, meaning no wear out for 1000 mile of use and no blisters. Money back or replacement if, within one year from date of purchase, either you experience blisters or the socks wear out within 1000 miles, provided care instructions have been followed and socks are returned with original receipt.